fix-bug (#852)

* fix-bug

* Update prepro.py

Author: zsdonghao

tensorlayer/prepro.py

@@ -3500,7 +3500,8 @@ def pose_crop(image, annos, mask, x, y, w, h):  # TODO : speed up with affine tr
                     adjust_joint.append((-1000, -1000))
                     continue
                 new_x, new_y = point[0] - x, point[1] - y
-                if new_x > 367 or new_y > 367:
+                # should not crop outside the image
+                if new_x > w - 1 or new_y > h - 1:
                     adjust_joint.append((-1000, -1000))
                     continue
                 adjust_joint.append((new_x, new_y))